Apply patch from https://github.com/synergy/synergy/issues/3749
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@ -1782,29 +1782,32 @@ CXWindowsScreen::doSelectEvents(Window w) const
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// that we select PointerMotionMask on every window. we also select
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// SubstructureNotifyMask in order to get CreateNotify events so we
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// select events on new windows too.
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//
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// note that this can break certain clients due a design flaw of X.
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// X will deliver a PointerMotion event to the deepest window in the
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// hierarchy that contains the pointer and has PointerMotionMask
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// selected by *any* client. if another client doesn't select
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// motion events in a subwindow so the parent window will get them
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// then by selecting for motion events on the subwindow we break
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// that client because the parent will no longer get the events.
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// FIXME -- should provide some workaround for event selection
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// design flaw. perhaps only select for motion events on windows
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// that already do or are top-level windows or don't propagate
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// pointer events. or maybe an option to simply poll the mouse.
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// we don't want to adjust our grab window
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if (w == m_window) {
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return;
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}
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// X11 has a design flaw. If *no* client selected PointerMotionMask for
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// a window, motion events will be delivered to that window's parent.
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// If *any* client, not necessarily the owner, selects PointerMotionMask
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// on such a window, X will stop propagating motion events to its
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// parent. This breaks applications that rely on event propagation
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// behavior.
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//
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// Avoid selecting PointerMotionMask unless some other client selected
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// it already.
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long mask = SubstructureNotifyMask;
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XWindowAttributes attr;
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XGetWindowAttributes(m_display, w, &attr);
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if ((attr.all_event_masks & PointerMotionMask) == PointerMotionMask) {
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mask |= PointerMotionMask;
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}
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// select events of interest. do this before querying the tree so
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// we'll get notifications of children created after the XQueryTree()
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// so we won't miss them.
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XSelectInput(m_display, w, PointerMotionMask | SubstructureNotifyMask);
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XSelectInput(m_display, w, mask);
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// recurse on child windows
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Window rw, pw, *cw;
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